Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 184)

‐ Prefixes advertised in router advertisement messages.
‐ Flags for host stateful autoconfiguration.
• Amount of time during which an IPv6 node considers a remote node reachable (for use by all nodes
on a given link).
IPv6 neighbor discovery configuration notes
NOTE
For all solicitation and advertisement messages, Brocade uses seconds as the unit of measure
instead of milliseconds.
• If you add a port to a port-based VLAN, and the port has IPv6 neighbor discovery configuration, the
system will clean up the neighbor discovery configuration from the port and display the following
message on the console.
ND6 port config on the new member ports removed
• Neighbor discovery is not supported on tunnel interfaces.
Neighbor solicitation and advertisement messages
Neighbor solicitation and advertisement messages enable a node to determine the link-layer address
of another node (neighbor) on the same link. (This function is similar to the function provided by the
Address Resolution Protocol [ARP] in IPv4.) For example, node 1 on a link wants to determine the
link-layer address of node 2 on the same link. To do so, node 1, the source node, multicasts a
neighbor solicitation message. The neighbor solicitation message, which has a value of 135 in the
Type field of the ICMP packet header, contains the following information:
• Source address: IPv6 address of node 1 interface that sends the message.
• Destination address: solicited-node multicast address (FF02:0:0:0:0:1:FF00::/104) that corresponds
the IPv6 address of node 2.
• Link-layer address of node 1.
• A query for the link-layer address of node 2.
After receiving the neighbor solicitation message from node 1, node 2 replies by sending a neighbor
advertisement message, which has a value of 136 in the Type field of the ICMP packet header. The
neighbor solicitation message contains the following information:
• Source address: IPv6 address of the node 2 interface that sends the message.
• Destination address: IPv6 address of node 1.
• Link-layer address of node 2.
After node 1 receives the neighbor advertisement message from node 2, nodes 1 and 2 can now
exchange packets on the link.
After the link-layer address of node 2 is determined, node 1 can send neighbor solicitation messages
to node 2 to verify that it is reachable. Also, nodes 1, 2, or any other node on the same link can send a
neighbor advertisement message to the all-nodes multicast address (FF02::1) if there is a change in
their link-layer address.
Router advertisement and solicitation messages
Router advertisement and solicitation messages enable a node on a link to discover the routers on the
same link.
IPv6 neighbor discovery configuration notes
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